> I noticed in the example link below from the API documentation that if
> you put in some fields such as London to New York you get a
> javascript: ' An unknown error occurred' message
>
> Could anyone tell me why this happens

It happens because the directions server can't come up with a sensible
(overland) route from London to New York.  The relatively simple
examples check for a few common errors, but any others such as this
get lumped in as 'unknown'.  Do a 'veiw source' in your browser to see
the error handler.

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